dom/canvas/CanvasGradient.h

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #ifndef mozilla_dom_CanvasGradient_h
   6 #define mozilla_dom_CanvasGradient_h
   7
   8 #include "mozilla/Attributes.h"
   9 #include "nsTArray.h"
  10 #include "mozilla/RefPtr.h"
  11 #include "mozilla/dom/CanvasRenderingContext2DBinding.h"
  12 #include "mozilla/dom/CanvasRenderingContext2D.h"
  13 #include "mozilla/gfx/2D.h"
  14 #include "nsWrapperCache.h"
  15 #include "gfxGradientCache.h"
  16
  17 namespace mozilla {
  18 namespace dom {
  19
  20 class CanvasGradient : public nsWrapperCache {
  21  public:
  22   NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CanvasGradient)
  23   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(CanvasGradient)
  24
  25   enum class Type : uint8_t { LINEAR = 0, RADIAL };
  26
  27   Type GetType() { return mType; }
  28
  29   mozilla::gfx::GradientStops* GetGradientStopsForTarget(
  30       mozilla::gfx::DrawTarget* aRT) {
  31     if (mStops && mStops->GetBackendType() == aRT->GetBackendType()) {
  32       return mStops;
  33     }
  34
  35     mStops = gfx::gfxGradientCache::GetOrCreateGradientStops(
  36         aRT, mRawStops, gfx::ExtendMode::CLAMP);
  37
  38     return mStops;
  39   }
  40
  41   // WebIDL
  42   void AddColorStop(float offset, const nsACString& colorstr, ErrorResult& rv);
  43
  44   JSObject* WrapObject(JSContext* aCx,
  45                        JS::Handle<JSObject*> aGivenProto) override {
  46     return CanvasGradient_Binding::Wrap(aCx, this, aGivenProto);
  47   }
  48
  49   CanvasRenderingContext2D* GetParentObject() { return mContext; }
  50
  51  protected:
  52   friend struct CanvasBidiProcessor;
  53
  54   CanvasGradient(CanvasRenderingContext2D* aContext, Type aType)
  55       : mContext(aContext), mType(aType) {}
  56
  57   RefPtr<CanvasRenderingContext2D> mContext;
  58   nsTArray<mozilla::gfx::GradientStop> mRawStops;
  59   RefPtr<mozilla::gfx::GradientStops> mStops;
  60   Type mType;
  61   virtual ~CanvasGradient() {}
  62 };
  63
  64 }  // namespace dom
  65 }  // namespace mozilla
  66
  67 #endif  // mozilla_dom_CanvasGradient_h